Hoffman Mechatronics
Bridgeport Mill J1 Rebuild
10.2 Feed Trip Adjustment
The Bridgeport Quill Feed is a very useful feature of the Bridgeport Mill, but it must be adjusted
properly to prevent damage to the feed mechanism within the mill. Figure 54 below illustrates
the components used during the feed trip adjustment.
Feed Trip Lever
Adjustment
Figure 54 - Feed Trip Lever
With the cir-clip for the quill stop screw resting on the lower boss, bring the quill stop nut down
to the quill feed nut. Loosen the locknut for the quill feed trip lever adjustment and loosen the
quill feed adjustment screw about 4-5 turns. Engage the quill feed lever, and slowly turn the trip
lever adjustment screw upwards until the quill feed lever trips and tighten an additional ½ turn.
Re-tighten the locknut. Not all Feed Trip Levers have the locking nut. On my machine you will
note that instead the feed trip lever acts as the locking mechanism for the adjustment bolt.
10.3 Spindle Lubricant
The spindle lubricant is a low viscosity lubricant used to lubricate the spindle bearings. Oil is
applied using the oil cup located on the top right side of the machine as shown in figure 55
below. Spindle oil may also be applied to those cups that provide oil to the gearing as well.
Back Gear Lube
Cup
Spindle Lube
Cup
Figure 55 - Spindle and Back Gear Lube Cups
BPJ1RBLD_002
55
January 31, 201111
